Electric Turbo, a Technology for Stoichiometric Combustion and Increased Efficiency
The next Euro 7 Emission Regulation will probably require gasoline engines to have full λ=1 combustion operation, in order to limit production of pollutants deriving from rich combustion. Since such operation will significantly limit engine output, few technologies as water injection, cooled exhaust EGR, variable compression ratio, integrated cooled exhaust manifold, Miller cycle with Variable Turbine Geometry and, more recently, electric turbocharger have gained visibility for the purpose of maintaining power density and displacement.